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    Effect of Cucurbit[7]uril on Adsorption of Aniline Derivatives at Quartz

    Year: 2022

    Journal: Coatings, Volume 12, AUG

    Authors: Wang, Kui; Jiang, Xiaoming; Hao, Chunling; Tao, Zhu

    Organizations: Open Fund Project of State Key Laboratory of Efficient Utilization of Medium and Low-Grade Phosphate Ore and Its Associated Resources [WFKF2018-05]

    Keywords: adsorption; cucurbit[7]uril; aniline derivative; quartz; QCM-D

    The adsorption behavior of small molecules at solid-liquid interfaces have become an important research topic in recent years. For example, small molecules of aniline pollutants will adsorb on solid surfaces with a massive discharge of industrial wastewater and are difficult to separate. Therefore, their adsorption and desorption on solid surfaces have become an important scientific problem. In this study, the interactions of cucurbit[7]uril (Q[7]) with 4,4 '-diaminodiphenylmethane (MDA) and benzidine (AN) are studied using 1H NMR, UV-Vis spectrometry and fluorescence spectroscopy. The results show that Q[7] forms an inclusion complex with MDA and AN. According to the results of Quartz Crystal Microbalance with Dissipation (QCM-D), MDA adsorbs onto a quartz surface and forms a viscous adsorption layer on it. The AN adsorbs on the quartz surface and forms a rigid adsorption film on it. Q[7] can reduce the adsorption of MDA on the quartz surface and increases the adsorption of AN on it. Through the dynamic adsorption experiments, we find that Q[7] has a desorption effect on MDA molecules adsorbed on the quartz surface. An Atomic Force Microscope (AFM) is used to measure the morphological changes in the adsorption film before and after Q[7] makes contact with the quartz surface, and it proves that Q[7] has a desorption effect on MDA molecules adsorbed on the surface.
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